Troubleshooting - Yamaha WR450F Owner's Service Manual

TROUBLESHOOTING

EAS2GC1363
The starter motor fails to turn.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
5. Air filter case cover
1. Check the fuse.
Refer to "CHECKING THE FUSES"
on page 9-68.
OK 
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 9-69.
OK 
3. Check the starter motor operation.
Refer to "CHECKING THE START-
ER MOTOR OPERATION" on page
9-75.
NG 
4. Check the starter motor.
Refer to "CHECKING THE START-
ER MOTOR" on page 6-38.
OK 
5. Check the relay unit (Starting circuit
cut-off relay).
Refer to "CHECKING THE RE-
LAYS" on page 9-72.
OK 
6. Check the diode.
Refer to "CHECKING THE DIODE"
on page 9-73.
OK 
7. Check the starter relay.
Refer to "CHECKING THE RE-
LAYS" on page 9-72.
OK 
ELECTRIC STARTING SYSTEM
NG 
Replace the fuse(s).
NG 
• Clean the battery terminals.
• Recharge or replace the battery.
OK 
Starter motor is OK. Perform the electric
starting system troubleshooting, starting
with step 5.
NG 
Repair or replace the starter motor.
NG 
Replace the relay unit.
NG 
Replace the diode.
NG 
Replace the starter relay.
9-10